Dry coal powder gasification furnance

ABSTRACT

A dry coal powder gasification furnace comprises a furnace body. The furnace body consists of a gasification furnace body for hot and dirty coal gas ( 1 ) and a hot and dirty gas reforming and cleaning furnace body ( 2 ). There is a gasification chamber ( 3 ) in the upper part of the gasification furnace body ( 1 ) and a settling chamber ( 4 ) in the lower part of the gasification furnace body ( 1 ). There are multiple coal powder nozzles ( 9 ) at the upper part of the gasification furnace body ( 1 ). One ends of the multiple coal powder nozzles ( 9 ) are connected to the gasification chamber and another ones are connected to a coal-spraying pipe ( 8 ). The coal-spraying pipe ( 8 ) is connected to a screw feeder ( 7 ). The screw feeder ( 7 ) is mounted below a loading lock hopper ( 6 ). Multiple gas nozzles ( 10 ) connected to the gasification chamber ( 3 ) are mounted at the upper part of the gasification furnace body ( 1 ) and below the coal powder nozzles ( 9 ). Multiple regulating gasification nozzles ( 11 ) connected to the gasification chambers ( 3 ) are mounted at the middle part of the gasification furnace body ( 1 ) and below the multiple gas nozzles ( 10 ). Multiple cool nozzles ( 12 ) connected to the settling chamber ( 4 ) are provided at the lower part of the gasification furnace body ( 1 ). Water-cooled walls ( 13 ) are provided in the settling chamber ( 4 ). A water-cooling grate ( 19 ) is mounted in the middle part of the reforming and cleaning furnace body ( 2 ). The fluidized bed gasification furnace with the nozzles is simple in structure and reliable in operation. The compositions of the produced coal gas can be easily controlled and the high-pressure coal gas produced can be directly supplied to users.

BACKGROUND OF THE PRESENT INVENTION

1. Field of Invention

The present invention relates to a device for preparing coal gas, and more particularly to a dry coal powder gasification furnace.

2. Description of Related Arts

In the metallurgy and chemical industry, the clean coal, gasified coal and high heating value hydrogen-containing coal gas have been widely utilized. The present invention is a manufacturing device of a method of preparing high pressure high hydrogen-containing coal gas, which is a prior China patent application No. 200610045968.1.

SUMMARY OF THE PRESENT INVENTION

An object of the present invention is to provide a coal powder gasification furnace that can produce high pressure and high hydrogen-containing coal gas.

Accordingly, in order to accomplish the above object, the present invention provides a dry coal powder gasification furnace, which includes a furnace body comprising a gasification furnace body for hot and dirty coal gas and a hot and dirty gas reforming and cleaning furnace body. There is a gasification chamber in the upper part of the gasification furnace body and a settling chamber in the lower part of the gasification furnace body. There is a plurality of coal powder nozzles at the upper part of the gasification furnace body. One ends of the coal powder nozzles are connected to the gasification chamber and the other ends are connected to a coal-spraying pipe. The coal-spraying pipe is connected to a screw feeder. The screw feeder is mounted below a loading lock hopper. A plurality of gas nozzles connected to the gasification chamber is mounted on the upper part of the gasification furnace body and below the coal powder nozzles. A plurality of regulating gasification nozzles connected to the gasification chambers are mounted on the middle part of the gasification furnace body and below the multiple gas nozzles. A plurality of cool nozzles connected to the settling chamber are provided on the lower part of the gasification furnace body. Water-cooled walls are provided in the settling chamber. The gasification chamber is connected to and communicated with the reforming and cleaning furnace body on a lower part thereof through a connecting channel. A gas outlet is provided on an upper portion of the reforming and cleaning furnace body. A feeding bell is provided on top of the reforming and cleaning furnace body, a plurality of cool nozzles is provided on a lower portion of the reforming and cleaning furnace body, and a discharging lock hopper is provided on the bottom of the reforming and cleaning furnace body. A water-cooling grate is mounted in the middle part of the reforming and cleaning furnace body.

The plurality of gas nozzles, regulating gasification nozzles and cool nozzles are all upwardly inclined.

The advantages of the present invention are illustrated as follows.

-   -   1. The fluidized bed gasification furnace and the nozzles are         simple in structure, easy to be manufactured and reliable in         operation.     -   2. High temperature steam and air or oxygen directly participate         the gasification reaction without ignition device.     -   3. Hydrogen contained in the coal gas is increased, and the         consumption of pure oxygen is lowered.     -   4. The operation is simple and the component of the coal gas is         easily controlled.     -   5. Water cooled slag is solidified and there is no waste water.         At the same time, the residual heat of the slag can be         recollected to produce high temperature steam.     -   6. The desulfurating process is simple and efficient.     -   7. The high pressure coal gas produced can be supplied to the         consumer directly without extra pressure device.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a perspective view of a dry coal powder gasification furnace according to a preferred embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT

Referring to FIG. 1 of the drawings, a dry coal powder gasification furnace according to a preferred embodiment of the present invention is illustrated, in which the dry coal powder gasification furnace comprises a gasification furnace body 1 for hot and dirty coal gas and a hot and dirty gas reforming and cleaning furnace body 2. The gasification furnace body 1 for hot and dirty coal gas is a fluidized high temperature furnace. The liquid is sprayed through a plurality of side nozzles and the steam and oxygen or high temperature air is blown upwardly and inclinedly. There is a gasification chamber 3 in the upper part of the gasification furnace body 1 and a settling chamber 4 in the lower part of the gasification furnace body 1. The gasification chamber 3 adopts refractory inner liner and heat-insulating outer liner, and the settling chamber 4 adopts water-cooled wall liner. The gasification chamber 1 is connected to and communicated with the reforming and cleaning furnace body 2 on a lower part thereof through a connecting channel 5. The reforming and cleaning furnace body 2 adopts refractory inner liner and heat-insulating outer liner. The coal gas is discharged from the top of the reforming and cleaning furnace body 2. There is a plurality of coal gas nozzles 9 on the upper part of the gasification furnace body 1. The plurality of coal gas nozzles 9 is connected and communicated with a coal-spraying pipe 8. A plurality of gas nozzles 10 connected to the gasification chamber 3 is mounted on the upper part of the gasification furnace body 1 and below the coal powder nozzles 9. A plurality of regulating gasification nozzles 11 connected to the gasification chambers 3 are mounted on the middle part of the gasification furnace body 1 and below the multiple gas nozzles 10. The dried coal that is crushed by the coal grinding machine is feed into the loading lock hopper 6, and into a coal-spraying pipe 8 through a screw feeder 7. High temperature steam is inputted into the coal-spraying pipe 8, and sprays the coal powder into the gas gasification chamber 3 through the coal powder nozzles 9. The steam is preheated by a high efficient steam preheater, and the air is preheated by a high efficient air heater. The preheated high temperature air or oxygen and steam are sprayed into the gas gasification chamber 3 through the gas nozzles 10 below the coal-spraying pipe 8. The high temperature steam and air sprayed from the gas nozzles 10 are fully mixed with the coal power. The regulating gasification nozzles 11 spray high temperature air or oxygen into the furnace to adjust the production of the reaction. The raw coal gas produced in the reaction enters into the reforming and cleaning furnace body 2. The slag in the raw coal gas enters into the settling chamber 4 due to gravity. A plurality of cool nozzles 12 are provided in the lower part of the settling chamber 4 for spraying low temperature steam thereinto. A water-cooled wall 13 is provided in the settling chamber 4. A slag outlet 14 is provided on a bottom of the settling chamber 4, and a discharging lock hopper 15 is provided on the slag outlet 14. The slag is solidified through the water-cooled wall 13 and the solidified slag is discharged out of the furnace through the discharging lock hopper 15. The raw coal gas enters into the reforming and cleaning furnace body 2 through the connecting channel 5. A water-cooling grate 19 is mounted in the middle part of the reforming and cleaning furnace body 2. A feeding bell 16 is provided on the top of the reforming and cleaning furnace body 2 and an air outlet 20 is provided on the feeding bell. Add a certain amount of coke mixed with lime into the furnace through the feeling bell 16. When passing through the coke, the unreacted steam in the raw coal gas is decomposed into hydrogen and CO, part of the CO2 can be reduced into CO, and H2S can be absorbed by the lime. The reduced coal gas is discharged outside of the furnace through air outlet 20 above the reforming and cleaning furnace body 2. A plurality of cool nozzles 17 and discharging lock hopper 18 are provided on a bottom of the reforming and cleaning furnace body 2. The low temperature steam solidifies the slag produced in the reaction of the coke and gas, and the slag is discharged outside of the furnace through the discharging lock hopper 18. The residual heat of the gas output from the reforming and cleaning furnace body 2 is recollected, the dust of the gas is eliminated, and the TRT residual pressure of the gas is used to generate electricity. After these steps, the gas is stored in a medium pressure tank to be used by the consumer. 

1. A dry coal powder gasification furnace, comprising: a gasification furnace body for hot and dirty coal gas having a gasification chamber in an upper part of the gasification furnace body and a settling chamber in the lower part of the gasification furnace body, wherein a plurality of coal powder nozzles is provided on an upper part of the gasification furnace body, one ends of the coal powder nozzles are connected to the gasification chamber and the other ends are connected to a coal-spraying pipe, which is connected to a screw feeder mounted below a loading lock hopper; a plurality of gas nozzles connected to the gasification chamber is mounted on an upper part of the gasification furnace body and below the coal powder nozzles; a plurality of regulating gasification nozzles connected to the gasification chambers are mounted on a middle part of the gasification furnace body and below the multiple gas nozzles; a plurality of cool nozzles connected to the settling chamber are provided on a lower part of the gasification furnace body; a water-cooled walls are provided in the settling chamber. and a hot and dirty gas reforming and cleaning furnace body, connected to and communicated with the gasification chamber on a lower part thereof through a connecting channel, comprising a gas outlet provided on an upper portion, a feeding bell provided on top thereof, a plurality of cool nozzles provided on a lower portion thereof, and a discharging lock hopper provided on a bottom thereof, and a water-cooling grate mounted in a middle part thereof.
 2. The dry coal powder gasification furnace, as recited in claim 1, wherein the plurality of gas nozzles, regulating gasification nozzles and cool nozzles are all upwardly inclined.
 3. The dry coal powder gasification furnace, as recited in claim 1, wherein coal powder is sprayed into the furnace by high pressure steam through nozzles, a plurality rows of high temperature air or oxygen and steam is prayed inclinedly and upwardly into the furnace through the nozzles below the coal powder nozzles, and the components of the gas can be adjusted.
 4. The dry coal powder gasification furnace, as recited in claim 1, wherein the steam is preheated up to 1100° C.-1300° C. by a steam preheater, and the air is preheated up to 1000° C.-1200° C. by a air preheater.
 5. The dry coal powder gasification furnace, as recited in claim 1, wherein a gas produced by the furnace contains 35-50% CO, 38-43H₂, and small amount of CH₄ and N₂, which can be used as fuel, chemical material, and raw material to extract H₂.
 6. The dry coal powder gasification furnace, as recited in claim 1, wherein hot and dirty gas reforming and cleaning furnace body may be used for reforming gas in a coke furnace. 